class_docstr: This class is responsible for building components for semantic segmentation. 
code: def optimizer_r(self) -> paddle.optimizer.Optimizer:
      opt_cfg = self.config.optimizer_r_cfg
      lr_cfg = self.config.lr_scheduler_r_cfg
  
      opt = self._build_optimizer(opt_cfg)
      lr = self._build_lr_scheduler(lr_cfg)
  
      opt = opt(self.model.branch2, lr)
      return opt
  
imports: import copy
  from typing import Any, Optional
  import yaml
  import paddle
  from paddleseg.utils import logger
  from paddleseg.cvlibs import Builder
  from paddleseg.utils.utils import CachedProperty
  from cvlibs import Config
  from batch_transforms import BoxMaskGenerator
  from .None import manager
  from utils import utils
label_desc: Use image node_id 6 for calling the CPSBuilder obj's underlying member method code with example usage: obj.optimizer_r() and returns: opt